So...my questions are:
1) Can you, and how would you, buffer a fuzz to preserve its tone when used with other pedals?
2) Are there any germanium fuzz face type pedals out there that sound ace and aren;t affected by the other pedals in the chain?
3) Would I solve my problems by getting a pedalboard looping set up, where each pedal, or each combination of pedals, is isolated from each other?
I'm no expert here, but my understanding of the issues:
1) Most people seem to feel that a buffer in front of a fuzz makes them not work right, and yes, this is an impedance issue. So, put your fuzz face first in your chain. I'm not sure, but I would imagine that you could put a buffer after the fuzz without too much problem, though you might have to experiment with input pull down resistors to get the impedance right.
2) I doubt it. The interactions with the guitar are a part of the sound, just like with a tube amp.
3) Yes, as long as there is a physical switch isolating them from one another (could be a footswitch, or a relay). Or you could modify all your other pedals to true bypass switching. They will, of course, still effect the fuzz when they are ON, but when they are off it won't be a problem. If you are really ambitious, you could build something like
THIS - I did - but you could also go with something much simpler.
Gabriel